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annotate src/video/SDL_yuv_sw_c.h @ 3466:a288892cd24c

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SDL_RenderReadPixels() needs to flush asynchronous operations before it reads. The semantics are that it reads the back buffer, and those pixels may not be available once SDL_RenderPresent() has happened.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 05:05:19 +0000
parents 94fb40a4a9a7
children f7b03b6838cb
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_video.h"
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25 #include "SDL_sysvideo.h"
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26
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27 /* This is the software implementation of the YUV texture support */
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28
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29 struct SDL_SW_YUVTexture
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30 {
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31 Uint32 format;
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32 Uint32 target_format;
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33 int w, h;
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34 Uint8 *pixels;
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35 int *colortab;
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36 Uint32 *rgb_2_pix;
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37 void (*Display1X) (int *colortab, Uint32 * rgb_2_pix,
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38 unsigned char *lum, unsigned char *cr,
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39 unsigned char *cb, unsigned char *out,
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40 int rows, int cols, int mod);
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41 void (*Display2X) (int *colortab, Uint32 * rgb_2_pix,
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42 unsigned char *lum, unsigned char *cr,
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43 unsigned char *cb, unsigned char *out,
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44 int rows, int cols, int mod);
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45
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46 /* These are just so we don't have to allocate them separately */
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47 Uint16 pitches[3];
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48 Uint8 *planes[3];
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49
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50 /* This is a temporary surface in case we have to stretch copy */
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51 SDL_Surface *stretch;
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52 SDL_Surface *display;
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53 };
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54
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55 typedef struct SDL_SW_YUVTexture SDL_SW_YUVTexture;
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56
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57 SDL_SW_YUVTexture *SDL_SW_CreateYUVTexture(Uint32 format, int w, int h);
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58 int SDL_SW_QueryYUVTexturePixels(SDL_SW_YUVTexture * swdata, void **pixels,
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59 int *pitch);
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60 int SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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61 const void *pixels, int pitch);
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62 int SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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63 int markDirty, void **pixels, int *pitch);
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64 void SDL_SW_UnlockYUVTexture(SDL_SW_YUVTexture * swdata);
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65 int SDL_SW_CopyYUVToRGB(SDL_SW_YUVTexture * swdata, const SDL_Rect * srcrect,
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66 Uint32 target_format, int w, int h, void *pixels,
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67 int pitch);
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68 void SDL_SW_DestroyYUVTexture(SDL_SW_YUVTexture * swdata);
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69
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70 /* vi: set ts=4 sw=4 expandtab: */